* Copyright 2014, Ingo Weinhold, ingo_weinhold@gmx.de.
* Distributed under the terms of the MIT License.
*/
#ifndef _ZLIB_COMPRESSION_ALGORITHM_H_
#define _ZLIB_COMPRESSION_ALGORITHM_H_
#include <CompressionAlgorithm.h>
enum {
B_ZLIB_COMPRESSION_NONE = 0,
B_ZLIB_COMPRESSION_FASTEST = 1,
B_ZLIB_COMPRESSION_BEST = 9,
B_ZLIB_COMPRESSION_DEFAULT = -1,
};
class BZlibCompressionParameters : public BCompressionParameters {
public:
BZlibCompressionParameters(
int compressionLevel
= B_ZLIB_COMPRESSION_DEFAULT);
virtual ~BZlibCompressionParameters();
int32 CompressionLevel() const;
void SetCompressionLevel(int32 level);
size_t BufferSize() const;
void SetBufferSize(size_t size);
bool IsGzipFormat() const;
void SetGzipFormat(bool gzipFormat);
private:
int32 fCompressionLevel;
size_t fBufferSize;
bool fGzipFormat;
};
class BZlibDecompressionParameters : public BDecompressionParameters {
public:
BZlibDecompressionParameters();
virtual ~BZlibDecompressionParameters();
size_t BufferSize() const;
void SetBufferSize(size_t size);
private:
size_t fBufferSize;
};
class BZlibCompressionAlgorithm : public BCompressionAlgorithm {
public:
BZlibCompressionAlgorithm();
virtual ~BZlibCompressionAlgorithm();
virtual status_t CreateCompressingInputStream(BDataIO* input,
const BCompressionParameters* parameters,
BDataIO*& _stream);
virtual status_t CreateCompressingOutputStream(BDataIO* output,
const BCompressionParameters* parameters,
BDataIO*& _stream);
virtual status_t CreateDecompressingInputStream(BDataIO* input,
const BDecompressionParameters* parameters,
BDataIO*& _stream);
virtual status_t CreateDecompressingOutputStream(BDataIO* output,
const BDecompressionParameters* parameters,
BDataIO*& _stream);
virtual status_t CompressBuffer(const iovec& input, iovec& output,
const BCompressionParameters* parameters = NULL,
iovec* scratch = NULL);
virtual status_t DecompressBuffer(const iovec& input, iovec& output,
const BDecompressionParameters* parameters = NULL,
iovec* scratch = NULL);
private:
struct CompressionStrategy;
struct DecompressionStrategy;
template<typename BaseClass, typename Strategy> struct Stream;
template<typename BaseClass, typename Strategy>
friend struct Stream;
private:
static status_t _TranslateZlibError(int error);
};
#endif
